Inside the Numbers: 5 Keys to Round 1 at St. Andrews
Dustin Johnson's opening-round score, which was also his second-consecutive 65 to start a major and equaled his best major-championship score.
He has had two other 65s: round 2 of the 2014 Open Championship and round 3 of the 2013 PGA Championship.
Putts taken by Jason Day, who trails Johnson by one shot.
Only two players had fewer: Padraig Harrington and Paul Lawrie. Day has five top-10s in his last 10 majors, but the British Open is usually his weak link. His best finish is a tie for 30th in 2011. His 66 was his first sub-70 in 16 British rounds.
Number of PGA Tour rounds this season Jordan Spieth has made seven or more birdies, after ringing up seven birdies and two bogeys on Thursday. (He’s three clear of his nearest competitors in that stat).
Spieth birdied five of his first seven holes and was 6-under after 11 before making bogeys at 13 and 17 in high winds. A curling 20-footer for birdie at 18 capped his day.
Number of players with tough afternoon tee times who shot 68 or better: Zach Johnson (66), Danny Willett (66) and Marc Warren (68).
Johnson and Willett each made just one bogey, Johnson on 17 and Willett on 11.
Tommy Fleetwood's cumulative score at the Old Course since competing in the 2011 Dunhill Links.
He shot a three-under 69 on Thursday to continue his mastery of the old links and justify the pundits who picked him as a potential sleeper to win this week.